$OpenBSD: patch-libs-external_USI++_src_misc_cc,v 1.1 2017/04/21 13:57:36 jca Exp $
--- libs-external/USI++/src/misc.cc.orig	Thu Apr 20 02:18:36 2017
+++ libs-external/USI++/src/misc.cc	Thu Apr 20 02:18:49 2017
@@ -1,5 +1,6 @@
 #include "usi++/usi++"
 #include "usi++/usi-structs.h"
+#include <cstdlib>
 #include <string.h>
 #include <unistd.h>
 #include <sys/ioctl.h>
